Cloaked in Danger (The Willoughby Family #2)
Jeannie Ruesch

Adam Willoughby, Earl of Merewood, finds London’s strangest new debutante fascinating, but when he catches her investigating his family’s secrets, he threatens to ruin her reputation. He doesn’t intend to enjoy it so much.
When their lustful indiscretion is discovered, Adam finds that he regrets nothing. But now, as her father’s enemy draws near, Adam must convince his betrothed that she can trust him with her own secrets…before it’s too late.